Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfbce00387a04be6…

MALICIOUS

PDF

92.1 KB Created: 2021-07-28 04:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23031301a01540e98b7b34a6684c7c5d SHA-1: 30fab4277a10928c046f5b2208145c930f186cb7 SHA-256: cfbce00387a04be649202c8354898e751dfe7f10f457ba9e04b3242d562162e4
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous URLs, some pointing to compromised WordPress sites, and exhibits characteristics of a link farm. Heuristics indicate lures for payment redirection and browser extension installation, suggesting a social engineering attack aimed at financial fraud or credential theft. No scripts were extracted, but the PDF structure itself is designed to host malicious links and content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/22683b7a19d724a96c385c810b958c4c/xekubibesi.pdf In PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/loreviz.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/31084260346.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/kitera.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/91655311759.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/22829400c255bb00c6548710973621c6/33653585290.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/32799028968.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d006b377164---nisumagunu.pdfIn PDF document text
    • https://etadelloro.it/images/file/61568422236.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/puwuligadavili.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/fezevubovowa.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/nemilege.pdfIn PDF document text
    • https://pasarangroup1.com/contents//files/dufem.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/6dde0e71ad0ff9821b6c4e72454c012f/45053115091.pdfIn PDF document text
    • http://mosjob.ru/images/file/kevetu.pdfIn PDF document text
    • http://ha-sine.com/d/files/6725076750.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/12/file/20210612_165436_137.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5d02e367e---fokuxajogutu.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/oo0v3i0fp4cl7ts4nf124mo758/zoxagodawojojenolenowituk.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/33n1mhtajk3olocq9ne067gj53/27345528012.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/j5mf98tekhcm72g5dgdu8jlpgk/60074641004.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/82147667315.pdfIn PDF document text
    • http://noahjohnsonsark.com/clients/e/ef/ef24418f2336b9480f3353ee42fa3f58/File/vebuwatelotow.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/34435330229.pdfIn PDF document text
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/3104223816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=free+cash+app+money+hack+2019+no+human+verificationPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 11512 bytes
SHA-256: b2c895d1e23face4f50e894ee46a1ab2831a349f68d2a0c324caa16944c20d93
font_01_sfnt_off00011c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C16 17500 bytes
SHA-256: e9f17511e2a64066c7bd3c402c6aaf84598a5c338cb3e3b29aee9ed1fdf27987
font_02_sfnt_off000149ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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